PET tracers: positron emitters and their half-lives
Fraction of positron-emitting nuclei left, N/N₀ = (1/2)^(t/T½); the red tick marks T½. A β⁺ annihilates with an electron and gives two 511 keV γ-rays that the scanner detects in coincidence.
Fraction of positron-emitting nuclei left, N/N₀ = (1/2)^(t/T½); the red tick marks T½. A β⁺ annihilates with an electron and gives two 511 keV γ-rays that the scanner detects in coincidence.